An Abnormal Increase of Fatigue Life with Dwell Time during Creep-Fatigue Deformation for Directionally Solidified Ni-Based Superalloy DZ445

Published on Mar 26, 2018in High Temperature Materials and Processes0.677
· DOI :10.1515/HTMP-2016-0079
Biao Ding1
Estimated H-index: 1
(SHU: Shanghai University),
Biao Ding1
Estimated H-index: 1
+ 2 AuthorsYongchun Liang5
Estimated H-index: 5
(EPRI: Electric Power Research Institute)
Source
Abstract
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Abstract High total strain-controlled creep-fatigue tests of 1.8% were performed for a directionally-solidified Ni-based superalloy, DZ445, at 900 °C in air. Dwell times of 0, 2, and 5 min. were introduced at the tensile peak strain for each cycle. Experimental results show a decrease in fatigue life with increasing dwell time. The significant cyclic softening is observed after the application of the dwell time. The mean compressive stress and large plastic-strain accumulation are produced due t...
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Abstract Creep-fatigue interaction behavior of nickel-based single crystal superalloy was studied in an in-situ SEM platform at 900 °C. Dwell times of 15, 30, 60, 90, 120 s were introduced at the tensile peak stress of each cycle. Experimental results showed that the life cycles firstly decreased rapidly then slightly increased with the increasing dwell time, which was explained by the accumulated inelastic strain. Dislocation microstructure and inelastic strain were correlated for different dwe...
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Abstract Total strain-controlled creep-fatigue tests were performed for a directionally solidified Ni-based superalloy at 850 °C in air. Dwell times of 0, 1, 2, 3, 5, and 8 min were introduced at the tensile peak for each cycle. The results demonstrated that the fatigue life firstly decreased and then slightly increased with increasing dwell time. The fatigue life showed a minimum at a dwell time of 3 min. The initial softening rate was faster than the subsequent softening rate when dwell times ...
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